JPS61181901A - Measuring device for effective diameter of nut - Google Patents

Abstract

PURPOSE:To enable QC at the work site easily and surely by holding a plug gauge having a min. dia. at the forward end side and a max. dia. at the base end side so as to be axially movable and measuring the axial displacement of a nut screwed in the plug gauge. CONSTITUTION:A plug gauge 16 is set to have its min. and max. diameters based on the tolerance of a nut N to be measured and the difference between the set size l1, a distance form the forward end till the step section 37a of a master gauge 37 for the min. tolerance and set size l2, a distance from the forward end till the step portion 38a is set as the tolerance of the nut N. When measuring, the nut N is screwed into the plug gauge 16 till no more moving-in and a stopper 17 is moved to contact to the end surface of the nut N and then a value indicated on a slider 30 in this situation is input to a computer. The slider 30 indicates the screw -in stop position of the nut N at the plug gauge 16 as a shifting amount in axial direction of the plug gauge 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a nut effective diameter measuring device used for inspecting and measuring the effective diameter of a female thread of a nut.

(Prior Art) As a conventional nut effective diameter measuring device, there is one shown in FIGS. 3(a) and 3(b), for example.

That is, the measuring device 1 shown in FIG. 3(a) measures a single effective diameter using the principle of a thread micrometer in measuring external threads, and the measuring device 1 shown in FIG. The other test piece 3 is provided via an elastic body that does not touch the test piece, and a dial gauge 4 for measuring the displacement of the other test piece 3 is provided.

The measuring device 5 shown in FIG. 3(b) measures the overall effective diameter of the nut N, and includes a pair of test pieces 6, 7 and a dial gauge 8, which operate in the same manner as the measuring device 1 described above. It is equipped with

Then, each measuring device 1.5 sets the tolerance range of the dial gauge 4.8 using a master gauge (not shown) that sets the maximum and minimum tolerance values of N. The nut N was installed and it was determined whether the effective diameter of the nut N was within the tolerance range, and the effective diameter of the nut N was calculated by determining the difference from the master gauge.

(Problems to be Solved by the Invention) However, while the conventional measuring device 1.5 as described above is suitable for precision measurement and precise inspection of products, Since it requires careful handling, it is extremely unsuitable for quality checks at work sites.At actual work sites, a thread gauge 9a and a stop screw gauge as shown in Figure 4 are used. By using the plug gauge 9 equipped with the plug gauge 9b, it has been possible to perform a sampling inspection to determine only whether or not a few samples meet the tolerance.

This invention was made by focusing on these conventional problems, and is a nut that can be used not only for precision measurement, but also for easy and reliable quality control at work sites. The purpose is to provide an effective diameter measuring device.

[Structure of the Invention] (Means for Solving the Problems) The nut effective diameter measuring device according to the present invention moves in the axial direction a plug gauge having a minimum diameter on the distal end side and a maximum diameter on the proximal end side. a stopper that suppresses the position of the plug gauge by coming into contact with an end face of a nut screwed into the plug gauge; and a measuring means that measures the displacement of the plug gauge in the axial direction. As the measuring means, for example, a caliper equipped with a digital mechanism can be used.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 is a diagram illustrating an embodiment of the present invention.

That is, the effective diameter measuring device 15 includes a plug gauge 16 having a minimum diameter on the distal end side and a maximum diameter on the proximal end side, and the plug gauge 16 which is screwed into the plug gauge 16. Stopper 17 that restricts the position of gauge 16
and a caliper 18 having a digital mechanism as a measuring means.

The plug gauge 16 has a minimum diameter and a maximum diameter set based on the tolerance of the diameter N to be measured, and has a threaded portion 16a at the tip for checking the minimum practical limit of the effective diameter. However, the threaded portion 16a is continuously provided with a tapered portion 16b whose diameter gradually increases toward the base end. The proximal end portion of the plug gauge 16 has a dimension exceeding the effective diameter, which is the maximum practical limit of N.

Further, the plug gauge 16 described above is equipped with a shaft 19 in a coaxial state at the base end, and by passing the shaft 19 through the cylindrical support part 22 of the support member 21 erected on the base 920, the plug gauge 16 can be rotated. and is held in a movable and axially movable state.

Further, a handle 23 used for rotationally operating the shaft 19 is attached to the base end of the shaft 19 (the left end in FIG. 1), and a handle 23 is attached between the base end and the cylindrical support portion 22. A cylindrical member 24 with a flange is fitted into the portion, and this cylindrical member 24 and the cylindrical support portion 22
By installing a compression coil spring 25 between them, the shaft 19 is biased toward the proximal end.

The stopper 17 is attached to a bracket 27 that is fixed to the support member 21 with a port 26 and extends near the plug gauge 16. It protrudes in the direction (rightward in FIG. 1).

The caliper 18 has a main scale 29 attached to the upper part of a frame 28 erected on a base 20 in parallel with the shaft 19, and a slider 3 with a built-in digital mechanism.
0, and a measuring element 31 is provided at the tip of the length 30a of the slider 30 to abut against the flange 24a of the cylindrical member 24 mentioned above. The caliper 18 has a tension coil spring 32, which has a smaller repulsive force than the compression coil spring 25, stretched between the end of the main scale 29 (the right end in the figure) and the slider 30. The probe 31 is always pressed against the flange 24a.

Note that the reference numeral 33 in the figure is a lever-type dial gauge, and this dial gauge 33 is attached to an arm 34 (not shown) with one end fixed. Position on the vertical line,
Furthermore, the measuring element 35 is configured so as to be able to come into contact with the end face of the oak screwed into the plug gauge 16. Further, reference numeral 36 is a computer cord connected to the caliper 18, and is configured to send the measured value of the slider 30 as an output signal to a computer (not shown).

Next, the operation of the effective diameter measuring device 15 will be explained.

First, before inspecting and measuring the nut N, it is necessary to set the tolerance of the nut N in the effective diameter measuring device 15. As such, a minimum value master gauge 37 for setting the minimum value of the tolerance and a maximum value master gauge 38 for setting the minimum value of the tolerance are used.

Both master gauges 37 and 38 are connected to the plug gauge 16.
At the same time, the tip end surface is attached to the plug gauge 16.
Each master gauge 37.3 is brought into contact with the flange 19a provided on the proximal end side of the
Step portions 37a and 38a formed at predetermined positions of 8 are used by contacting the stopper 17, and when the minimum value master gauge 37 is set, the zero point adjustment of the slider 30 in the caliper 18 is performed.

In other words, the set dimension 11 from the tip end face to the stepped portion 37a in the minimum value master gauge 37, and the set dimension 11 from the tip end face to the step portion 38a in the maximum value master gauge 38! The difference from 12 is set as the tolerance of Nara). Note that the tolerance range set as described above naturally exists in the tapered portion 16b of the plug gauge 16.

Further, the zero point and the maximum value of the tolerance displayed on the slider 30 are input into a computer (not shown) each time.

Next, to perform measurement, screw the nut N into the plug gauge 16 until it can no longer be screwed in, and then bring the end face of the nut N into contact with the stopper 17. In this state, the nut N shown on the slider 30 Input the values into the computer. Here, the slider 30 adjusts the screwing stop position of the nut N in the plug gauge 16.
It is displayed as the amount of movement in the axial direction.

Moreover, when the shaft 19 is rotated during the above measurement,
The inclination of the end face of the oak with respect to the central axis of the female thread is expressed as the swinging of the pointer of the dial gauge 33, and the inclination state of the end face can be checked by the amplitude of the pointer.

The inspection and measurement of the nuts N are usually performed on about five nuts, and each measured value is input into a computer.

In other words, as explained in the above embodiment, if a caliper 18 equipped with a digital mechanism is used as a measuring means and a computer is connected to the caliper 18, N.
It is now possible to automatically calculate the average value and deviation value of the effective diameter of each nut, create a histogram, etc. while making pass/fail judgments, and it is also extremely easy to conduct other quality trend surveys. .

In addition, as explained in the above embodiment, the plug gauge 16
By providing a threaded portion 16a at the tip of the nut, the minimum practical limit of the nut can be easily checked. Note that since the plug gauge 16 has tolerances set within the length range of the tapered portion 16b, a plug gauge compatible with other types of nuts may be required depending on the case.

Therefore, it is better to provide several types of plug gauges and to make them detachable from the shaft 19.

Furthermore, the configurations of the measuring means, shaft, and stopper are not limited to the above embodiments.

[Effects of the Invention] As explained above, according to the nut effective diameter measuring device of the present invention, a plug gauge having a minimum diameter on the distal end side and a maximum diameter on the proximal end side can be moved in the axial direction. a stopper that holds the plug gauge in the same state and abuts against an end surface of a nut screwed into the plug gauge to suppress the position of the plug gauge;
Since it is equipped with a measuring means for measuring the displacement of the plug gauge in the axial direction, it can be used not only for precision measurement and inspection, but also for easy and reliable quality control at work sites. Has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a front view illustrating a nut effective diameter measuring device according to an embodiment of the present invention, FIG. Figure (b) is a sectional view explaining the state in which the maximum value master gauge is attached to the plug gauge, and Figure 3 (a)
(b) is a cross-sectional view illustrating a single effective diameter measuring device and a total effective diameter measuring device in the conventional measuring device, and FIG. 4 is a front view illustrating a plug gauge equipped with a continuous thread gauge and a dead thread gauge. It is a diagram. 15... Effective diameter measuring device, 16... Plug gauge, 17... Stopper, 18... Caliper (measuring means), N... Nut. Patent applicant: Satorashi Co., Ltd. Patent attorney Yutaka Oshio Figure 2 (b) Figure 3 Figure 4

Claims (1)

[Claims] (1) A plug gauge having a minimum diameter on the distal side and a maximum diameter on the proximal side is held in an axially movable state, and the plug is brought into contact with the end face of a nut screwed into the plug gauge. 1. An effective diameter measuring device for a nut, comprising: a stopper for controlling the position of the gauge; and a measuring means for measuring the displacement of the plug gauge in the axial direction.